Save light bulbs. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
Comments on the article
Nowadays, incandescent bulbs are produced with a very small margin of safety. The current surge that occurs when the lighting is turned on often disables the light bulb due to the low resistance in the cold state. And the cost of a light bulb at our salaries "bites".
Therefore, when the lighting is turned on, the light bulb must be heated with a small current and then turned on at full power. This is what the gentle switching circuit shown in the figure does.
When the operating voltage is applied (SB1 is on), the VD3 thyristor is closed, the HL1 bulb is powered through the VD4 diode, which passes only a negative half-wave, so half the operating voltage is applied to the bulb. The mains voltage is rectified by the diode VD1 and through the divider R1 R2 begins to charge the capacitor C1.
When a certain voltage is reached, the VD2 zener diode breaks through and the voltage from the R1 R2C1 chain is applied to the control electrode of the VD3 thyristor. It opens and begins to pass a positive half-wave of mains voltage. From this moment on, the full voltage of the network is supplied to the light bulb and the light bulb lights up in full heat.
The turn-on process lasts about 2 seconds, which is enough to warm up the light bulb. When using a VD4 diode of type D226, light bulbs up to 120 W can be used. To achieve a power of 700 W, the author used the KD202 diode and put the thyristor on a small radiator.
For 10 years, the author has not failed a single light bulb. So draw your own conclusions.
Author: O.G.Rashitov, Kiev
See other articles Section Lighting.
<< Back
Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
| Random news from the Archive Satellite for creating artificial starfalls
20.01.2019
The Japan Aerospace Agency, using the Epsilon-4 rocket, launched seven satellites into Earth orbit, one of which will be used to create artificial starfalls.
The satellite was developed by Tokyo-based startup ALE. On board are 400 metal balls. At the appointed time, they will "shoot" from the satellite and fly towards the Earth, burning up in the process of flight in the upper atmosphere - from the surface of the planet it will look like a stream of meteorites.
The first artificial starfall is scheduled for the spring of 2020 - it will be carried out over Hiroshima.
ALE believes that if the weather is good, several million people will be able to observe the phenomenon. It is assumed that 20 balls will be enough for one meteor shower - thus, the reserve on the satellite will be enough for two dozen launches.
The composition of the alloy from which they are made is kept secret - the company notes that due to its composition, the balls will burn in the atmosphere longer than real meteorites.
|
Other interesting news:
▪ Car laser head-up display
▪ Wavecom CM52 - new automotive range wireless processor
▪ Revolutionary rocket engine
▪ Liquid with piezoelectric effect
▪ New series of SONY LCD monitors
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the website Residual current devices. Selection of articles
▪ article Miracles in a sieve. Popular expression
▪ article Can a person be born without fingerprints? Detailed answer
▪ article Truck driver. Standard instruction on labor protection
▪ article Generator for testing automobile tachometers. Encyclopedia of radio electronics and electrical engineering
▪ article Voltage stabilizer at the op-amp, 0,2 amperes. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese